NEET CONCEPT TEST -3 | BIOLOGY | STD 12 | CHAPTER -5

 

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Instruction

• Total 15 question
• Total  Marks 60
• Each Question 4 marks
• Negative marking -1 for each wrong Question

NEET CONCEPT TEST -3 | BIOLOGY | STD 12  | CHAPTER -5 

01. The alleles for MN blood group in humans show the phenomenon of
( a ) incomplete dominance   ( b ) codominance
( c ) dominant epistasis          ( d ) recessive epistasis .

02. Cystic fibrosis is a i  disorder due to genetic defect on chromosome . ii
               (i)                                 (ii)
( a ) sex - linked recessive       7
( b ) autosomal dominant       11
( c ) sex - linked dominant       12
( d ) autosomal recessive          7

03. What did Mendel condude from dihybrid cross in pea plant ?
( a ) Inheritance of one pair of alleles does not interfere in the inheritance of other pair of alleles .
( b ) Out of the two contrasting alleles , only one is able to express its effect in the individual .
( c ) Two factors of a character keep their identity distinct and separate at the time of gamete formation .
( d ) One trait of the character which did not appear in first generation must lie hidden or unexpressed in it .

04. Sex chromosomal disorders affect the males more than the females , because
( a ) the X - linked characters show criss - cross inheritance
( b ) recessive allele present on X - chromosome expresses singly in males and in homozygous form in females
( c ) X - linked genes are inherited from father to son only
( d ) all of these .

05. The progenies of a colour blind woman and a normal man will be
( a ) 100 % colour blind girls and 100 % carrier boys
( b ) 100 % colour blind boys and 50 % carrier girls
( c ) 100 % colour blind boys and 100 % carrier girls
( d ) 50 % colour blind boys and 50 % carrier girls .

06. In which of the following options , males show one barr body ?
( a ) 44 + XYY   ( b ) 44 + XXY   ( c ) 44 + XXXY   ( d ) 44 + XXX

07. Which of the following is incorrect about aneuploidy ?
( a ) It commonly arises due to non - disjunction of the two chromosomes of homologous pair .
( b ) Double trisomic has three different chromosomes in duplicate .
( c ) Tetrasomics show more variability than trisomics .
( d ) Nullisomic is deficient in a complete pair of homologous chromosomes .

08. The gene which gets suppressed by the presence of non allelic gene is termed as
( a ) epistatic gene    ( b ) recessive gene
( c ) hypostatic gene ( d ) supplementary genes .

09. What does the given symbol signify ?

( a ) Consanguineous mating ( b ) Still birth
( c ) Dizygotic twins                  ( d ) Identical twins

10. Read the given statements and select the correct ones .
( i ) Genotype remains same throughout the life of an individual .
( ii ) Individuals with different phenotype usually have same genotype .
( iii ) Alleles of a gene occupy the same gene locus on the two homologous chromosomes .
( iv ) Dihybrid cross is made between two organisms of a species to study the inheritance of two pairs of alleles of a single gene .
( a ) ( i ) , ( ii ) and ( iii )                   ( b ) ( i ) and ( iii )
( c ) ( iii ) and ( iv )                           ( d ) ( i ) , ( iii ) and ( iv )

11. Rohan is a 5 year old child . He is suffering from a very rare genetic disorder X due to chromosomal abnormalities . This condition X is due to a deletion of half part in the short arm of chromosome number 5. Rohan has a small head , widely spaced eyes , moon like face with congenital heart disease . Identify the disease X from which Rohan is suffering .
( a ) Edward's syndrome         ( b ) Turner's syndrome
( c ) Cri - du - chat syndrome  ( d ) Klinefelter's syndrome

12 . The back cross in which F , hybrid is crossed with its dominant parent , is carried out
( a ) to bring yield and quality from dominant parent
( b ) to study the genotype of F1 progeny
( c ) to study linkage
( d ) all of these .

13.Two heterozygous individuals ( Bb ) are crossed . What will be the percentage of pure homozygous individuals ?
( a ) 75 %   ( b ) 25 %    ( c ) 100 %   ( d ) 50 %

14.If the progenies from a marriage are of 25 % carrier girls and 25 % haemophilic boys , what are the genotypes of father and mother respectively ?
( a ) XY and XhXh   ( b ) Xhy and Xxh   ( c ) XY and Xxh   ( d ) xhY and Xx

15.In case of incomplete linkage ,
( a ) genes are located very closely in the same chromosome
( b ) more parental types are produced alongwith few recombinants
( c ) crossing over does not occur
( d ) dihybrid ratio will be 9 : 3 : 3 : 1 .

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ANSWER KEY

1. ( b ) 2. ( d ) 3. ( a ) 4. ( b ) 4. ( b ) 5. ( c ) 6. ( b ) 7. ( b ) 8. ( c ) 9. ( c ) 10. ( b ) 11. ( c ) 12. ( a ) 13. ( d ) 14. ( c ) 15. ( b )

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